Talk:Ductwork airtightness

In regards to UL 181 A/B
Theres a note under making ducts airtight that "be labeled in accordance with UL 181A or 181B"; While this is accurate, products listed under 181 a-m and 181b-m are acceptable for most duct work, and worth adding as options. TertiaryConductor (talk) 01:49, 22 September 2022 (UTC)